# Shared Flashcard Set

## Details

EXAM 1: Chapter 3
Cabling and Topology
18
Computer Science
10/02/2011

Term
 Topology
Definition
 Describes the way/method by which systems in a network connect.
Term
 How many different types of Topologies are there, and please describe them?
Definition
 1) Bus - A single bus cable connects the             computers in a line.    2) Ring - Connects all of the computers               on the network with with a               central ring of cable.   3) Star - Use a central connection for all               computers on the network.    4) Mesh - Every computer connects to                every other computer via 2 or                more routes.   5) Point-to-Multipoint - Sever is the                                      central point.   6) Point-to-point - Computer to                              Computer.
Term
 What is Bandwidth?
Definition
 - The maximum amount of data that goes through the cable per second is called the bandwidth.  - UTP cables are rated to handle a certain frequency, such as 100 MHz or 1000 MHz, which originally translated as the maximum throughput for a cable. Each cycle, each hertz basically, accounts for one bit of data. For example, a 10 million cycle per second (10 MHz) cable could accommodate 10 million bits per second (10 Mbps)—1 bit per cycle.
Term
 What are the 3 primary types of network cables?
Definition
 1) Coaxial    2) Twisted Pair   3) Fiber Optic
Term
Definition
 1) They have a central conductor wire surrounded by insulating material.   2) Shields data from Electro-magnetic interference (EMI).   3) Two types: RG-59: Used for television, but was too thin for networking.  RG-6: Predominant cabling used today 4) All coaxial cables have an RG rating, measured in Ohms, which checks the wire's resistance/impedance.
Term
 What are the 2 types of Twisted Pair cables; and, please expand on them...?
Definition
 1) Shielded Twisted Pair - Twisted pairs of wire surrounded by shielding to protect from EMI (crosstalk). Rare. Not as needed.   2) Unshielded Twisted Pair (UTP) -     - Twisted wires surrounded by a plastic        jacket.       - UTP cables handle different amounts       of frequencies, rated in Megahertz       (Mhz), and are thusly placed in       category ratings (CAT).
Term
 What are the primary UTP cables used today?   What are their maximum frequencies, bandwidth?
Definition
 Cat 3 --- 16 MHz --- 16 Mbps   Cat 5 --- 100 MHz --- 100 Mbps   Cat 5e --- 100 MHz --- 1,000 Mbps   Cat 6 --- 250 MHz --- 10,000 Mbps   None of these cables can go over 100 meters.
Term
 What is a Fiber Optic Network, and what are the 2 types of cables used?
Definition
 1) Transmits data through light rather than        through electricity.   2)  Multimode – Uses LEDs to send light signals.                      Single-mode – Uses Laser light to send signals.
Term
 What are the advantages of using Fiber Optic networks?
Definition
 1) Can transmit data over long ranges (over 10+ kilometers!)   2) Useful in high EMI areas   3) Hard to hack into
Term
 Which of the following topologies require termination?   A) Star   B) Bus   C) Mesh   D) Ring
Definition
 Bus topology In a bus topology, all computer connect to the network via a main line. The cable must be terminated at both ends to prevent signal reflection.
Term
 Of the topologies listed, which one is the most fault tolerant?   A) Point-to-point   B) Bus   C) Star   D) Ring
Definition
 Star Only star topology has fault tolerance.
Term
 What is the term used to describe the interconnectivity of network components?   A) Segmentation   B) Map   C) Topology   D) Protocol
Definition
 Topology
Term
 Coaxial cables all have a(n) ________ rating.   A) Resistance   B) Watt   C) Speed   D) Ohm
Definition
 All coaxial cables have an Ohm rating.   RG-59 and RG-6 are both rated at 75 Ohms.
Term
 Which of the following is a type of coaxial cable?   A) RJ-45   B) RG-59   C) BNC   D) Barrel
Definition
 RG-59 is a type of coaxial cable.
Term
 Which network topology connects nodes with a central ring of cable?
Definition
 Ring topology connects nodes with a central ring of cable.
Term
 Which network topology is most likely seen only in wireless networks?   A) Star   B) Bus   C) Ring   D) Mesh
Definition
 Mesh is, for the most part, unique to wireless networks.
Term
 Which of the following is a duplex fiber-optic connection?   A) LC   B) RJ-45   C) ST   D) SC
Definition
 Of the options given, only the LC connector is designed for duplex fiber-optic.
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